Patent application number | Description | Published |
20080278675 | Polarization Gratings in Mesogenic Films - A polarization grating comprising a polarization sensitive photo-alignment layer ( | 11-13-2008 |
20100110363 | POLARIZATION GRATINGS IN MESOGENIC FILMS - A polarizer including a polarization grating comprising a polarization sensitive photo-alignment layer and a liquid crystal composition arranged on said photo-alignment layer. An alignment pattern, corresponding to the polarization pattern of a hologram, is recorded in the photo-alignment layer, and the liquid crystal composition is aligned on the photo-alignment layer. | 05-06-2010 |
20120086903 | POLARIZATION GRATINGS IN MESOGENIC FILMS - A polarizer including a polarization grating comprising a polarization sensitive photo-alignment layer and a liquid crystal composition arranged on said photo-alignment layer. An alignment pattern, corresponding to the polarization pattern of a hologram, is recorded in the photo-alignment layer, and the liquid crystal composition is aligned on the photo-alignment layer. | 04-12-2012 |
20120188467 | BEAM STEERING DEVICES INCLUDING STACKED LIQUID CRYSTAL POLARIZATION GRATINGS AND RELATED METHODS OF OPERATION - A beam steering apparatus includes a first beam steering stage and at least a second beam steering stage arranged in-line with the first beam steering stage. The first beam steering stage includes a first polarization grating comprising a uniaxial birefringent material having a first periodic director pattern, and the second beam steering stage includes a second polarization grating comprising a uniaxial birefringent material having a second periodic director pattern. In nonmechanical embodiments, a polarization selector may be arranged to provide a circularly polarized input beam incident on the first polarization grating. In mechanical embodiments, at least one of the first polarization grating and the second polarization grating may be operable to be independently rotated about an azimuth thereof. Related methods of operation are also discussed. | 07-26-2012 |
20130027656 | MULTI-TWIST RETARDERS FOR BROADBAND POLARIZATION TRANSFORMATION AND RELATED FABRICATION METHODS - An optical element includes at least two stacked birefringent layers having respective local optical axes that are rotated by respective twist angles over respective thicknesses of the at least two layers, and are aligned along respective interfaces between the at least two layers. The respective twist angles and/or the respective thicknesses are different. The at least two stacked birefringent layers may be liquid crystal polymer optical retarder layers. Related devices and fabrication methods are also discussed. | 01-31-2013 |
20130335683 | POLARIZATION-INDEPENDENT LIQUID CRYSTAL DISPLAY DEVICES INCLUDING MULTIPLE POLARIZING GRATING ARRANGEMENTS AND RELATED DEVICES - A liquid crystal device includes a first polarization grating, a second polarization grating, and a liquid crystal layer. The first polarization grating is configured to polarize and diffract incident light into first and second beams having different polarizations and different directions of propagation relative to that of the incident light. The liquid crystal layer is configured to receive the first and second beams from the first polarization grating. The liquid crystal layer is configured to be switched between a first state that does not substantially affect respective polarizations of the first and second beams traveling therethrough, and a second state that alters the respective polarizations of the first and second beams traveling therethrough. The second polarization grating is configured to analyze and diffract the first and second beams from the liquid crystal layer to alter the different directions of propagation thereof in response to the state of the liquid crystal layer. Related devices are also discussed. | 12-19-2013 |
20140078298 | SNAPSHOT SPATIAL HETERODYNE IMAGING POLARIMETRY - Polarization based channeled images are optically demodulated to produce directly viewable images. A channeled image flux is converted to an unpolarized flux by a phosphor or other sensor, and the resulting converted flux is demodulated by modulating at a spatial frequency corresponding to a modulating frequency of the channeled image flux. After modulation, the converted flux is spatially filtered to remove or attenuate portions associated with the modulation frequency and harmonics thereof. The resulting baseband flux is then imaged by direct viewing, projection, or using an image sensor and a display. | 03-20-2014 |
20140285878 | Polarization Conversion Systems with Polarization Gratings and Related Fabrication Methods - A polarization conversion system includes a lens element, a polarization grating comprising a diffractive element having a spatially-varying local optical axis, and a retarder element. The polarization grating is arranged to receive light that is output from the lens element, and the retarder element arranged to receive polarized light of different polarization states that is output from the polarization grating and change the different polarization states to a same polarization state. Related devices and fabrication methods are also discussed. | 09-25-2014 |